Rock-drill.



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L T E E E S x T E .m S M A2 D UL WIL N E ml A D.. 7. 0 9 1 2| Lm DATUM OT.. ORM CDL I I .JKF GW O HRM A 0 I L P P A wi h1 mozo M. 831,059. PATENTED MAR. s, 1908. H. J. 000K.

BooK DRILL.

APPLTION FILED JULY 2, 1997.

2 SHBETS-SHEET 2.

@vw-anto@ attenua@ i -Stete of Iowa,

HENRYJAMES Coon, or oT'TuMWA, Iowa.

no. senese lo all whom 'it muy concem Be it known that I, HENRY JAMES Coon, a

citizen of the United States, and e resident of ttumwa, in the county of l/Vapello and have invented certein new and useful Improvements in Rock-Drills, of which the following is a full, clear, and exact speciication.

My invention relates to rock drills of the t "pe employing compressed air for actuating t e hammer, and has for its oh'ect the probvision of improvements by W ich the air used'for driving the hammer, after exhausting, is employed to forni e. seel'to prevent ieahage of thewater used to flush the boring.

To this end my invention consists in providina striking-block between the hammer kand -e drill-bit having the Water-hose con- -neotedtherewith and a central hole for con'- vejving the iiushingvwater to the drill-blt hoed end providedwith other holes or. surface-grooves for conveying the exhaust air to, a chamber surrounding the end of the ra-gmental, sectional showuig a moduicatwn dill-hit, or, if preferred, grooves may be formed on theinner side the striking-heed to convey the airto the chamber atoresaid.

The construction and operation of im# 1 froved rook-drill will he described in""d. etail ereinaiter and illustrated in the aceozhpenying drawings, in Whioh- Figure .1 1e a longitudinal sectional view of the driii end of a rook-drin showing my im- 4roveinents; Fin. la, e view ofthe other end; ig. 2, a detai view of the striking-block shown in Fig. ;v Fi 3, a cross-section of' a 'striking-block invoivin a modification of the structure shown ilfg; and Fig. 4, a view of the casing `with the air passages formed in the casing.

n the drawings similar reference characters indicate corresponding parts throughout the severalview l indicates the casing of my improved drill :tween the center and the surface of the strikhaving the tubular drill-stein 2 having its shank 3 mounted in one end thereof. The drill-sten1 2 is formed tuhuarfor the passa e of. Water or other iiushing element to te dxr'hhore. Secured to the other end of the casing; i isV the compressed-air conduit e for eonveyingjhe eir from air-pipe (not shown) of the casing aroundl Patentes time e, ieeea sez-m1 No. 381,895.

' secured in hole 5 to' the'duct easing i that empties into the hemor-ehsmher '2.

8 indicates the hammer that is. eonstruoted hollow and rovided with a ed hesse `against lsfhe the air presses to raise. the

hammer at; the be e ofthe-stroke.

9 indicates a hole in the hammer through which the compressed air enters the inside of the hammer to drive it downward in com pleting the stroke.

This structure of drill/es shove described, is now inl common use, the hanuner strik directly against the head of the.. drilhstem 2 and atercompleting the'stroite-theeir ese holes made therein for that Myvimprovement consists ins the provision of a strikinghead 10 between the drilletem 2 end-the. hammer 8,`having a centre! hote thereto andconnected with the central' hole "l1 to convey water, air, or other hush-ing eiement to the drill-stern, the strilfizogvhead l() engaging thehead ot stern 2 and the holes in the hit.

My invention further .contempiates the ntilizatiouof the exhausteir from the ham- 'her. in not only forcing the water through. it e hole but also -m providing a Watenseel to prevent the leakage of the Weiter hom the connection betweenthe drill-stem and the etxking-hesd. This I accomplish hv pro,- viding air-ducts for the passagefo the en haustair from stnihinghead l0 to a chembeo 14 surround the head of the drill-stem 2.

15, formed in the surface of the' strilinlagl f' head.

In Fig. 3 the duots'coneist oi'holes 15a he- In Fig. l these' isshewnsevemlfenhsustw 11 therein and a hosfsoonneotion 12 seeured the hit and the striking-head registering so' as to permit the flushing element to iiow into in Figs. l and 2 the ducts for the passe.' e A of the exhaust eir'from the chamber 13 tot lchamber 14, consist of longitudinal grooves y the chamber `13 shove the hausts from the casing through oneormoeo stem by pressure'exerted on the. central air around the head of the bit, while in Fig. 4

'but a single exhaust-port is shown, the pressure being equalized by providing an annular duct 17 connecting with the port.

1S indicates a rubber bushing on the hoseconnection to prevent it from becoming crystallized because of the vibration of the hammer.

Having thus described my improvements, what claim isl. ln a roch-drill, a casing having a tubular drill stem mounted atone end, an airropelled hammer, a striking-head mounted between the hammer and the drill-stem having a hole therein that registers with the hole in the drill-stem, and ha hose connection secured to said striking-head and communieating with the hole therein, substantially shown and described.

l i2. ln a com ressed-air roch-drill, in combination with t ie casing, a tubular drill-stem mounted in the casing and having its inner end spaced apart from the inner surface of the casing to form a chamber, an air-propelled hammer inthe casing, a striking-head 1n the casing between the drill-stem and lthe i hammer having a longitudinal hole theref drill-stem,substantially as shown and de through that registers with the hole in the drill-stem, a hose connection secured to said striking-head and communicating with the longitudinal. hole therein to convey a llushing element thereto, and means to convey a part of the exhaust air from the hammer past the striking-head to the chamber around thc scribed.

ln a com ressed-air rock-drill, m combination with t ie casing, a tubular drill-stein mounted in the casing and having its inner end spaced apart from the inner surface of the casing to form a chamber, an air-propelled hammer in the casing, a striking-head in' the-casing between thc drill-stein and the hammer having a central opening therethrough-that registers with the hole in' the drill-stem, and means to convey the exhaust air from the hammer to the chamber around the drill-stem to form a seal for, the connection between the striking-head and the drillstem., substantially as shown and described.

l e. in a compressed-air roi-lr-drill, in coinbination with the casing, a tubular drill-stem mounted in the casing and having its inner end spaced apart from the inner surface of 'thecasingto l'orm a chamber, an air-propelled hammer in the casing, a strilri.iig-head inA the casinfl between the drill-stein and the hammer' having a central opening thorethrough that registers with'tl'ie lhole in the drill-stem, and air-ducts formedv in the striking-head for the, passage of the air exhausted se nose from the hammer to the chamber around the drill-stem, substantially as shown and described.

5. ln a com ressed-air rock-drill, in combination With-t e casing, a tubular drill-'stem mounted in the casing and having its inner` end. spaced apart from the inner surface of the casing to form a chamber', an air-propelled hammer in the casing, a striking-head inthe casing between the drill-stem and the hammer having a central opening there through that registers with the hole in the drill-stem, and grooves in the surface of the striking-head forming ducts for the passage of air exhausted from. the hammer to the chamber around the drill-stem, substantially as shown and described.

6. In a com ressed-air rock-drill, in combination with t 1e casing, a tubular drill-stem mounted in the casing and having its inner end spaced apart from the inner surface of the casing to form a chamber, an air-propelled hammer in the casing, a striking-head in the casing between` the drill-stem and the hammer having a central opening therethrough that registers with the hole in the drill-stem, la hose connection secured to the striking-head and communicating'with the central hole therein to convey a flushing element thereto, and nleaus to convey the exhaust air from the hammer to the chamber around the drill-stem to form a seal for the connection betweenthe striking-head and the drill-stem, substantially as shown and described.

7. In acorn ressed-air rock-drill, in combination with t ic casing, a tubular drill-stem mounted in the casing and having its inner end spacedl apart from the'innerI surface of the casing to form a chamber, an ,air-propelled hammer in the casing, a striking-head in the casing between the drill-stem and the hammer having a vcentral opening therethrough that registers with the hole in the drill-stem, a hose connection secured to the' striking-head and communicating with the central hole therein to convey a lushing element thereto, and air-ducts formedv in the striking-head for the passage of the air eX- hauslted from the hammer to the chamber around the drill-stein, substantially` as shown and described.

8. In a con'ipressed-air rock-drill, in combination with the casing, a tubular drill-stem mounted in the'c'asing and having itsjnner soy end spaced apart v from the inner surface of the casing to formK a chamber, an air-propelled hammer in the cas1ng,"a`striking head in the casing between the drill-stem and the hammer having a central opening therethrough that registers with the hole in the drill-stem, a hose connection secured to the s1 ing-head and Communicating with the 1n Witness whereof have hefsugtp stlgy central opemng therem to convey a, fiushmg hand 1n presence of two subscribing wit element thereto, and grooves' in the surface messes.

of the strikng-head forming ducts for the HENRY JAMES CG'L A passage of au exhausted from the hsmmer Witnesses: v

to the chamber around the dflbstem, suh- GUY L. COOPER, stantially as shown and. descibed. A S. J. WILCOX. 

